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Cupronickel foil product illustration

Standard Cupronickel Foil

Cupronickel Foil

Standard-grade rolled Cu-Ni alloy foil, a professional CIVEN Metal product for corrosion resistance, resistor elements and marine engineering. With outstanding corrosion resistance, stable resistivity and excellent mechanical strength, it is a reliable material for harsh environments.

· Product Features

  • B10 / B19 / B30
  • Cu-Ni alloy
  • STANDARD FOIL
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Product Story

Your Most Trusted Line of Defense Against Corrosion

Among all copper alloys, cupronickel (Cu-Ni alloy) stands out for its unmatched corrosion resistance. Adding nickel not only changes the material's color, from copper red to silvery white, but fundamentally reshapes its chemical stability. In seawater, salt spray and mild acid or alkaline media, cupronickel foil shows oxidation and corrosion resistance far beyond ordinary copper alloys.

CIVEN standard cupronickel foil is available in three mainstream grades: B10 (about 10% nickel), B19 (about 19% nickel) and B30 (about 30% nickel). The higher the nickel content, the better the corrosion resistance and strength, but the higher the cost. Our technical team recommends the most cost-effective grade for each customer's application environment: the best grade is not the most expensive one, but the one that fits best.

Beyond corrosion resistance, cupronickel foil has another unique advantage: a very low temperature coefficient of resistance. Its resistance barely changes with temperature, making it an ideal material for precision resistors, shunts and measuring instruments. For electronic equipment that needs stable long-term output, this temperature insensitivity is an irreplaceable guarantee of quality.

Thickness ranges from 35 to 90 microns, with widths from 4 mm to 250 mm. The specification range is relatively focused, which reflects cupronickel foil's specialized role: it is mainly used in critical components that demand extremely high material reliability rather than in large-area general-purpose applications. Every micron of thickness is there to withstand harsh environments.

10–90 μm
Thickness range
±3 μm
Thickness tolerance
4–250 mm
Width range
≤50 ppm/°C
Temperature coefficient of resistance

Why CIVEN METAL

Why Choose CIVEN Metal?

🏆 CIVEN Metal's Quality Commitment in Standard Cupronickel Foil

The core value of cupronickel foil lies in compositional consistency and durability. Through strict melting control and rolling process management, CIVEN keeps nickel content deviation within ±0.3% on every roll and batch-to-batch resistivity variation below 2%. For component manufacturers whose products must work reliably for years in harsh environments, this consistency translates directly into longer product life and lower quality risk.

Outstanding Corrosion Resistance

Excellent performance in seawater and salt spray makes it the material of choice for marine engineering, ship fittings and coastal equipment. A dense passivation layer forms naturally on the surface, allowing long-term use without additional coatings.

Low Temperature Coefficient of Resistance

Resistance changes very little with temperature (≤ 50 ppm/°C), suitable for precision resistors, shunts, measuring instruments and other applications with very high temperature stability requirements.

High Strength with Toughness

Tensile strength of 450–700 MPa while maintaining good ductility. Can be stamped and bent without cracking, accommodating complex part geometries.

Stress Relaxation Resistance

Retains good elastic recovery under high temperature and high stress, with little tendency toward stress relaxation. Suitable for fasteners and spring parts carrying fixed loads over the long term.

Reliable Fast Delivery

Standard specifications ship in 3 days, custom specifications in 7 days. Small trial orders (from a few dozen kilograms) are supported to help R&D teams shorten validation cycles.

Complete Certifications

ISO 9001 quality management system certification, RoHS compliant. Every shipment comes with a COA; third-party SGS test reports available on request.

Applications

Which Harsh Environments Is It Built For?

From marine engineering to precision instruments, CIVEN standard cupronickel foil supports key components in high-end manufacturing with outstanding corrosion resistance and electrical stability

Marine Engineering

Tube sheets for ship heat exchangers, desalination equipment components and offshore platform structural parts. Maintains stable performance in long-term use in seawater and salt spray.

Precision Resistor Elements

Precision resistors, current shunts and resistive elements for measuring instruments. A very low temperature coefficient of resistance ensures long-term measurement accuracy.

Coins & Commemorative Coins

Coin blanks, commemorative coin substrates and collectible metal sheets. An attractive silvery-white appearance with wear and corrosion resistance, suitable for long-term circulation or collection.

Heat Exchange Components

Condenser fins, evaporator heat sinks and heat pipe composite substrates. The combination of good thermal conductivity and corrosion resistance makes it ideal for thermal management.

Chemical Equipment

Chemical vessel linings, valve sealing gaskets and anti-corrosion pipe coatings. Shows excellent corrosion resistance in mild acid and alkaline media.

Medical Devices

Dental metal materials, surgical instrument parts and implantable device housings. Good biocompatibility and resistance to corrosion by body fluids.

Get In Touch

Let Us Find the Best Solution for Your Project

Whether you need large volumes of standard specifications or small custom batches, CIVEN Metal offers flexible supply options. Free sample books, COA certificates and vacuum-packed export service are all available.